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Re: Using the AppleColor display for Raspberry Pi output [message #275804 is a reply to message #275770] Tue, 16 December 2014 14:43 Go to previous messageGo to previous message
scott is currently offline  scott
Messages: 3639
Registered: February 2012
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In article <alpine.DEB.2.02.1412161507580.16785@pi>,
Alistair Ross <ajross@gmail.com> wrote:
> Yep, I tried all of those modes, including the PAL one to no avail, and
> yes, I've tried pressing the button. I can see colour in Apple 2 games etc
> on the monitor, so I'm assuming that the B&W mode is switched in the off
> position.
>
> The monitor does jump around, but a quick adjustment of the HOLD pot at the
> back of the monitor makes it nice and steady. The picture looks pretty
> visible with perhaps just a little bit of flicker, nothing too
> headache-inducing though!

If you have to tweak the vertical-hold knob when you switch between the
Raspberry Pi and the Apple II's composite output, that would suggest that
they're outputting different video standards. A PAL monitor can often
display an NTSC signal (or vice versa) if you tweak the vertical hold; in
both cases, you aren't going to get color.

Someone suggested NTSC 4.43 (50 Hz field rate, 4.43 MHz colorburst) as a
possibility. The Raspberry Pi won't produce that type of signal, so if
that's what your monitor is expecting, you're stuck. :-?

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